The topic describes the structure of the digestive system and the process of digestion in earthworms.

Lesson Outcomes

• At the end of this lesson, the student will be able to:
• Explain that the digestive tract of the earthworm is a long, straight tube extending from its mouth to the anus
• Explain that the muscular gizzard is the proventriculus
• Explain that the typhlosole is the dorsal infold of the intestine wall that increases the area of absorption